To open a small restaurant, you need to apply for a pollution discharge permit: first, apply to the environmental protection bureau's accreditation office in the jurisdiction. After accepting it, the staff will come to check and guide. The two necessary conditions for obtaining a sewage permit are: there can be no residential buildings upstairs; Sewage should be incorporated into the municipal sewage pipeline. On-site inspection staff will decide which range hood to install according to the size of the business area. I bought my own home range hood or a range hood that has not been recognized for environmental protection. The staff of the accreditation office reminded that it is best to consult the environmental protection department before deciding to rent a store or decorate it. For example, when some shopkeepers open a shop for decoration, the smoke outlet or the window of the kitchen is just aimed at the residents behind. Even if the management department doesn't know for a while, the residents behind will still complain and often have to spend money to adjust.